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Finding the Fourth Proportional to 438.69, 658.07 and 256.10

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Solution

The fourth proportional to 438.69, 658.07 and 256.10 is: 384.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.69 : 658.07 = 256.10 : x
  2. Step 2: Convert to fraction form
    438.69/658.07 = 256.10/x
  3. Step 3: Cross multiply
    438.69x = 658.07 × 256.10
  4. Step 4: Simplify right side
    438.69x = 168,534.01
  5. Step 5: Solve for x
    x = 168,534.01/438.69
  6. Step 6: Final answer
    x = 384.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.